A practical synthesis of ethyl 1,2,4-triazole-3-carboxylate and its use in the formation of chiral 1′,2′-<i>seco</i>-nucleosides of ribavirin
作者:Purushotham Vemishetti、Robert W. Leiby、Elie Abushanab、Raymond P. Panzica
DOI:10.1002/jhet.5570250253
日期:1988.3
A practical and efficient synthesis of ethyl 1,2,4-triazole-3-carboxylate (6a, R' = H) from ethyl carboethoxyformimidate hydrochloride (7) is described. Alkylation of this heterocycle with the chloromethyl ethers of 1,3-O-dibenzylbutane-1,2R,3S-triol (8a) and 1,3,4-O-tribenzylbutane-1,2R,3S,4-tetrol (8b), followed by conversion of the ester function to the amide and deprotection, furnished the chiral
描述了一种从碳乙氧基甲酰亚氨基甲酸乙酯盐酸盐(7)实用有效地合成1,2,4-三唑-3-羧酸乙酯(6a,R'= H)的方法。该杂环与1,3 - O-二苄基丁烷-1,2 R,3 S-三醇(8a)和1,3,4- O-三苄基丁烷-1,2 R,3 S,4-的氯甲基醚烷基化替他洛尔(8b),然后将酯官能团转变成酰胺并脱保护,分别提供了利巴韦林,11a和11b的手性1',2'-癸二核苷。